THE FINAL COUNTDOWN Flashcards
Parallel pins: they parallel the _____ __ ______ with the pins being part of the ______ ________.
path of insertion….cast restoration
Non-parallel pins: placed in the tooth to retain a _____
core build up
Pins for core retention: place in sound ______ and do not undermine ______
DENTIN…ENAMEL
Pins for core retention: Place ______ between the outer surface of the pulp
halfway
Pins for core retention: **sorround by at least ___mm of dentin
0.5mm
WHERE is the safest location to place a pin for core retention?
line angles/corners of the teeth
Core pins-THREADED place __mm deep
2mm
core pins-CEMENTED place __mm deep
4mm
Which pin is more retentive-threaded or cemented?
THREADED
Threaded pins are _____ than their respective hole, and cemented pins are _____ than their respective hole
threaded are LARGER….cemented are smaller (to fit cement)
When the sulk are normal and healthy and bands of attached gingival are adequate, margins can be placed up to ___mm inside the sulcus
0.5mm
What is biological width in mm? What two anatomical tissues make it up?
2.04mm…Junctional Epithelium + Connective Tissue (so from the attachment of the gingiva to the crest of the alveolar bone)
Grooves are placed __mm deep and __mm wide in “buik tooth structure” (looks like dentin mainly)
1mm, 1mm…dentin
Failure rates for endodontically treated teeth: single crown: __%, FPD abutment: __%…RPD abutment ___%
single crown 5%, FPD abutment 11%….RPD abutment 23%
Using a post in an endo treated tooth is NOT to _______ the tooth, but only to _______ the core material.
reinforce the tooth….retain the core material
FERRULE-when placing a crown over a core build up, you need a minimum of ___mm of crown length past the margin of a core build up…IDEAL is ___mm
1.5mm minimum…IDEAL 2.0mm
Post diameter should be ___ of the root diameter, Post length should be ___ the length of the root
1/3 diameter…2/3 length
Maintain at least ___mm of apical seal when placing a post, but the post length must be at least _____ to the length of the crown
4mm…equal
Active post- has _______ to engage dentin, RANK its retention??, made of ____
threads….BEST retention….metal
passive post-______ in diameter than the drill diameter and it is adhesively _____ to the tooth
smaller…adhesively
hybrid post- ACTIVE at the ______ area, PASSIVE at the _____ area, made of _____, and helps with mechanical _______
HYBRID = ACTIVE AT CORONAL, passive at apical area…made of metal…mechanical retention
“extrude a tooth” for restoration, what determines how far we need to extrude the tooth?
biological width
What is the most aesthetically pleasing pontic form?
ovate
What are the two types of poetics that DO NOT contact the gingiva? How far are they from the ridge?
sanitary and modified sanitary…2mm
What is the advantage of the modified sanitary pontic form?
Broader connectors
In a non-ridged connector, the keyway is on the ______ and the key is on the ______
keyway = retainer, key=pontic
PINS need to be surrounded by ___mm of sound dentin
0.5mm
Treat an asymptomatic tooth endodontically for ______/ to have a dowel.
retention..wow thats cray cray yo
The ideal ratio for FPD retainers is a ___:___ clinical crown:root surface ratio.
clinical crown 2:root surface 3
What law? Root surface area of the abutment teeth had to be equal or surpass that of the
teeth being replaced with pontics.
Ante’s law
Size of connectors- posterior
2mm O-G, 3mm B-L
Size of connector-anterior
3mm I-G ,2mm B-L
What is time you have to mix the material?
mixing time
What is time before material begins to set; starts from the time you began mixing and includes the time you have to load material into tray or syringe
working time
What is Time it takes for material to be completely set (from start to finish)
setting time
What type of PROVISIONAL LUTING cement is SELF CURE? give 2 examples.
ZINC OXIDE based….Tempbond and Tempbone NE
What type of PROVISIONAL luting cement is DUAL cure? Give 2 examples.
Resin based…Tempbond Clear, ProViLink
How thick is provisional cement?
25 microns
When do you sandblast a crown?
after the initial try in and before cementing
PERMANENT CEMENTS-oldest cement used, does not bond, easy to clean
ZINC PHOSPHATE
POLYCARBOXYLATE Cement- made of ______, introduced in 1968. does it penetrate dentin? How much time do you have? is it a good PERMANENT luting cement?
ZINC OXIDE….does NOT penetrate dentin, have 30 freaking seconds, not recommended for permanent cement
G.I. cements-ADHERES to ____ and_____…Disadvantages-intial _____ setting, ______ sensitive, post-cementation _______
enamel and dentin…intital SLOW setting, MOISTURE sensitive, post-cementation SENSITIVITY
What is the BIGGEST DISADVANTAGE to Resin Modified G.I. luting cement?
possible fracture, it expands
Resin luting cements- VERY _______ SENSITIVE
TECHNIQUE
Shrinkage-gold-__%
1.5%
shrinkage- Ni-Cr ___%
2.4%
Impression trays: A device used to _____, ______, and _____ impression material while making an impression
carry, confine, control
Custom trays- ROOM ___mm to ___mm for PVS, ___INCH for alginate
2mm-4mm PVS, 1/4inch alginate
Custom tray-___mm apical to crest of Free Gingiva, stops are ___ degree angle
5mm…45 degree
Custom incised guide table prevents fracture of the _____ during crown fabrication, does the pin touch the table?
stone…NO
What are the three MUNSELL color system components?
HUE, CHROMA, VALUE
What are the three ways to get the Pt to CR?
1.Chin point guidance 2.BiManual Manipulation 3.Unguided-with leaf point
